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Aquarium Hydrometers - Premium Salinity Refractometer with Automatic Temperature Compensation for Saltwater, Aquarium, Marine Reef Tank Testing - Dual Scale (0-100ppt & 1.000 to 1.070 S.G.)
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Aquarium Hydrometers - NA Professional Aquarium Refractometer Hydrometer with Automatic Temperature Compensation,Salinity (0-100 PPT) and Specific Gravity (1.000-1.070) for Saltwater/Brackish/Marine/Reef Tank Testing
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Aquarium Hydrometers - XinJiaYi Water Salinity Refractometer, Dual Scales Hydrometer: Specific Gravity 1.000-1.070 & PPT 0-100 (1‰ = 1ppt = 1000 ppm), Handheld Seawater Tester for Aquarium, Marine Fish-Keeping, Pool Tank
